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 help please

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aaron1



Posts : 1
Join date : 2012-04-12

PostSubject: help please    Thu Apr 12, 2012 8:23 am

have a 1977 yamaha rd400 so one of my spark plugs went bad so i changed it and now that side is getting way hotter than the other please help
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hugh sym



Posts : 46
Join date : 2012-03-14
Location : on the floor with 15 dogs on sofa

PostSubject: Re: help please    Thu Apr 12, 2012 2:19 pm

RD 400, love the old Yam air cooled 2 strokers had 3 x 400 dx's, 4 x 250's 2 x 200's and a pretty rear 200 torque induction model,,, mind you had a few seize up and melted a few pistons over the years,,,
Check you got the same plugs and gapped right in each cylinder, swap plugs over see if problem follows the plug, if your on points check them for gap, pitting,, along wires, earths, condensers, coils, leads. Then check the fuel side, carbs, balance pipe, air box cracked rubber inlets, reeds, any air leak will weaken the mix and cause over heating. Then the lube side of things for blockage and leaks,, to much or to little will cause her to over heat also, hope you get her sorted out,,, Hugh
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